Bladed projectile



Oct. 18, 1932 E, w, BRANDT 883,758

BLADED PROJECTILE Filed Oct. 24, 1950 go blades.

Patented Oct. 18, 1932 stares @AEEN? FFEQE BLADED PBOJEGTILE Applicationfiled October 24, 1930, Serial No. 491,045, and in France November 9,1929.

w called relays or additional charges, disposed between the blades ofthe blading and ignited by the cartridge gases issuing throughperforations provided in the tail of the projectile. This method is,however, limited at an early 5 stage by the number of spaces available,be-,

tween the blades, for the accommodation of said additional charges.Moreover, the irregular distribution of the additional charges may leadto the deformation of some of the On the other hand, the individualcharge in said additional charges cannot be increased beyond a certainlimit without risking deformation of the blades by the effect of thepowder gases, and, of course deviation of the projectile on itstrajectory.

The present invention aims at obviating the foregoing drawbacks andincreasing the range of the projectile, by the aid of a blading,articularly distinguished by the followan ing eatures:

One or more passages are provided in the blades, which are uniformlydistributed round the tail (for example, six blades at a relative angleof The two edges of the blades comprise two or more tapered portionsfolded on both sides-of the blade in such a way as to increase theperipheral stability and also to enable the additional charges to beattached on both sides of each blade.

- In another embodiment, intended more particularly to be applied toprojectiles of small calibre and low velocity, the attachment of theadditional charges is efi'ect'ed by the aid of suitably shaped passagesprovided in the blades, the folded portions which are without anynoteworthy effect on the stability by reason of the low velocity, beingomitted in this instance.

These arrangements present, in particular,

the advantage of rapidl equalizing the efforts exerted on both si es bythe wowder .gases contained in the additional 0 ar es,

and thus eliminating all risk of deformation of the blades, so that morepowerful addi- '55 tional charges can be employed and greater rangesconsequently obtained.

The invention also enables a larger number of additional charges to bemounted on the projectile and thus still further increase 60' its range.It also assures the simultaneous ignition and complete combustion of allthe additional charges, and consequently maximum precision of aim. Theform and arrangement of the blades enables their num- 85 her to bereduced, thus simplifying manufacture while obtaining unimpeachablestabilization.

Other advantages and special features of the invention will a pear fromthe following Fig. 2 is a cross section of the tail of the 30 blading,along the line 2-2 of Fig. 1;

Fig. 3 is a modified blade, preferably applicable to projectiles of lowvelocity; and

Figs. 4 to 7represent various methods of attaching the additionalcharges.

The projectile of the invention (Figs. 1 and 2) comprises, at the rear,ablading composed of a certain number of blades, such as 1, 2, 3, 4 (sixin the example shown) distributed uniformly and secured in known wmanner round the perforated tail 5, which is mounted on the projectileby means of its threaded extremity, 6 or in any other way.

Perforations or gaps, such as 7, 8, provided in the blades olfer freepassage to the gases a5 liberated by the powder of the additionalcharges, whilst obviating all risk of deformation of the blades underthe unequal pressures actin on their two surfaces. On the other han theignition is transmitted instantly from one to other of the chambersformed between each pair of blades, thereby assuring perfect combustionof the powder in the relays, and therefore great precision of range.

It will be evident that several passages might be provided in place ofone, but it is, nevertheless, preferable to reduce their number to aminimum, with a View to lessening the eddies set up by the contact ofthe streams of air with the edge of each passage, the result of sucheddies being to retard the forward mcvement of the projectile.

As shown in Figs. 1 and 2, each blade is provided, in the peripheralregion, with a certain number of parts which are turned over,longitudinally, on either side of the blade (9, 10 for blade 1; 11, 12for blade 4). The overturned portions are preferably tapered off, asshown, and are designed so as to prevent eddies.

By means of these multiple folds, it is possible, with a smaller numberof blades as compared with the earlier models, and therefore with asmaller lateral and longitudinal stabilizing surface, to obtain the samestabilizing effect as before, the overturned parts constitutingperipheral surfaces which, owing to the velocity of the projectile,operate in a zone of high stabilizing action.

It may be mentioned here that the folded parts 9, 10, 11 and 12 displacethe stabilizing action in the direction of the periphery of the blading,without, however, retarding the projectile to the exaggerated degreethat would result from the employment of a complete crown or arch, ashas already been proposed for certain types of bladed projectiles.Moreover, the bent portions 9, 10, 11, 12 serve for the attachment ofthe additional charges, such as 13, 14, 15, which can thus be secured onboth sides of each blade, so that a maximum number of additional chargescan be mounted with a minimum number of blades. It is for this reasonthat the .device shown, comprising only six blades, enables sixadditional charges to be attached, instead of four in the case ofcertain earlier models which, nevertheless, comprised eight blades. Animportant increase of range is thus practicable. Each blade may also bemade relatively thick, thereby offering greater resistance todeformation Without affecting the weight of the projectile.

In another embodiment (Fig. 5) of the invention, the blades 16 areprovided with passages 18 of suitable shape for the attachment of theadditional charges indicated by the dotted lines. This last type ofblading is more particularly intended for projectiles of small calibreand low velocity, in which the surfaces of peripheral stabilization maybe omitted without inconvenience, since, in this case the entire surfaceof the blades is situated in the reallv effective zone of action.

The free edges of the blades are rounded off as shown at 20, 21 (Fig. 1)or 22 (Fig. 3), to facilitate handling the projectiles and theirconveyance, if desired, in the gunners pouches. Y

The modified form of perforation 18' shown in Fig. 4 enables theadditional charges 23, 24 to be placed in one or other of the twoopposite positions indicated by dotted llnes at 23 (Fig. 5) and 24 (Fig.6). The additional charges may also be disposed across the blades, at25, 26, as shown in Fig. 7

It is self-evident that the present devices have been described andrepresented solely by way of explanation, and without being restrictive,and that various structural modifications may be introduced thereinwithout departing from the spirit and scope of the invention as definedin the appended claims.

Having now particularly described and ascertained the nature of my saidinvention and 1 in what manner the same is to be performed, I declarethat what I claim is:

1. A projectile for smooth bore guns, comprising a body, a plurality ofstabilizing blades mounted at the rear of'the body, blade comprising atleast one perforation, and propulsion charges each extending through theperforation of at least one blade and held in position by the walls ofsaid perforations.

2. Projectile for smooth bore guns, comprising. a body, a plurality ofstabilizing blades mounted at the rear of the body, each blade comprisinat least one perforation, and a plurality of which is located in theperforation of a blade and extends for substantially equal distances ateach face of the blade and is maintained in position by the wall of saidperforation.

3. Projectile prising a body, a perforated tubular tail fastened at therear of the body, a primary propulsion charge in said tail, a pluralityof radial stabilizing blades disposed uniforml for smooth bore guns,compropulsion charges each of about the periphery of said tail, eachblade comprising at least one perforation, and oppositely andperipherally folded portions at its free edge for producing asubstantially uniform stabilizing action, and a plurality of auxiliarypropulsion charges located between the blades in alignment with saidblade perforations and held in place between said blades by the foldedportions thereof.

4. Projectile for smooth boreguns, comprising a body adapted to fit thebore of the gun, a perforated coaxial tubular tail fastened at the rearof the body, a primary propulsion charge in said tail, a plurality ofstabilizing blades attached to said tail and disposed uniformly-aboutthe axisof the body and tail and extending substantially radiallybetween perforations thereof and having their outer edges of diameternot greater than the diameter of said body, each blade having at leastone perforation therethrough for permitting the passage of propulsiongases at the moment of firing whereby to eliminate inequalities ofpressure on the two faces of each I have hereunto'set my hand.

EDGAR WILLIAM BRANDT.

